Index: trunk/Ohana/src/opihi/include/display.h
===================================================================
--- trunk/Ohana/src/opihi/include/display.h	(revision 21153)
+++ trunk/Ohana/src/opihi/include/display.h	(revision 27435)
@@ -36,6 +36,6 @@
 int SendLabel (char *string, int Xgraph, int mode);
 
-int SendGraphMessage (int device, char *format, ...);
-int SendGraphCommand (int device, int length, char *format, ...);
+int SendGraphMessage (int device, char *format, ...) OHANA_FORMAT(printf, 2, 3);
+int SendGraphCommand (int device, int length, char *format, ...) OHANA_FORMAT(printf, 3, 4);
 int SendGraphCommandV (int device, int length, char *format, va_list argp);